Control mechanism for calculating machines



Dec. 27, 1938. H. K. F. EWALD ET AL 2,141,269"

CONTROL MECHANISM FOR CALCULATING MACHINES Filed 001;. 6, 1936 4 Sheets-Sheet l In venZ'or3:

Heinrich Konrad Frfi cdricl EwaYJ y JOlLln'neJ Cell-4rd? Dec. 27, 1938. H, K. F. EWALD ET AL CONTROL MECHANISM FOR CALCULATING MACHINES Filed Oct. 6, 1956 4 Sheets-Sheet 2 F/gr6 Z-M e ys 2-1, 1938. H. K. F. EWALD Em 2,141,269

CONTROL MECHANISM FOR CALCULATING MACHINES Filed Oct. 6, 1936 4 Sheets-Sheet 3 Ha. I

l wven 'om:

Heiwrc'cl ffov-u-ad Fried/(cl Ewa lal v- (fake 117166 Gebkzrdz Attorney Dec. 27, 1938. H. K. F. EWALD ET AL CONTROL MECHANISM, FOR CALCULATING MACHINES Filed Oct. 6, 1936 4 Sheets Sheet 4 Whiz 1.ll. E I

I77 ven Zo my: H. K. E EwaZd 512d 17. Geizarcl Patented Dec. 27, 1938 UNITED STATES PATENT OFFICE 2,141,269 comor. uacmimsu roa oawum'mro momma Heinrich Konrad Friedrich Ewald, Ohemnits, and Johannes Gebhardt, Siegmar-Schonau, Germany. assignors to Wanderer-Works vorm. Wlnklholer & Jaenieke AkL-Ges Siegmar- SchonamGerms-ny Application October incer-many 6, 1m, Serial No. 104,310

October 1!, 1935 4 anima- (UL 235-) will be particularly suitable for small calculating machines and will be of low cost of production. According to the present invention the control device is so connected with machine drive 15 means, such as a rock shaft, that both during the forward stroke and the return stroke of the machine drive means there will be performed a complete operative movement eiiecting bringing 1 into engagement and out of engagement one of 20 the accumulators or a plurality thereof.

' Diiierent constructional forms of the mechanism embodying the present invention are illustrated in the accompanying drawings, in which:

25 'l'lgure l is a side view oi the calculatingmachine mechanism,

Fig. 2 is a side view of the accumulators and their actuators,

Fig. 3 is a section showing a device for locking 30 the totalizer key and taken on line 3-8 of Fig. 4 is a side view of a modiiicatio Bg.5isaviewsimilartoFig.8with theparts in different positions, 35 Fig. 6 is a detail side view oi the control means with depressed totalizer key, I

Fig. '1 is a view similar to Fig. 6 with another position of the parts.

Fig. 8 is a part sectional'view oi. a device to 40 lock the totalizer.key taken on line H of Fig. 9 is a side view ot the device for the selection of diiierent accumulators according to Fig. 4, Pig. lisaviewsimilartol 'ig.8withanother position of the parts, and

Fig. ll'is a view similar to Fig. 9 with another position of the parts.

The drawings illustrate by way of example, the 50 application of the invention to a bookkeeping calculating machine with oscillatory drive means which in its iorwardstroke rocks a drive shaft I in the direction of arrow 2, and in its return stroke rocks said shalt in the opposite direc- 56 tion. A shaft 21, Figfl, is. connected in any suitable manner to the drive shaft I, and acutato'rs I are loosely mounted on the shaft 21. To the actuators I are Jointed type carriers 4 with types I, Fig. l, for printingdigits and symbols in cooperationwith a backing means 8, preferably a platen roll. The actuators l have sets of teeth I, I and accumulators 8, II can be brought into and out of engagement with these teeth by means 0! cam devices II, II.

The actuators I may be operated by any suit- 1 able known means. For example, the actuators 3 are moved upwardly, in the forward stroke of the machine drive with the type carriers 4, until they reach positions corresponding either to definite numbers governed by the depressed numher keys or a sum in an accumulator S or ill. The digit values set in this manner may be entered additively during the return stroke of the machine drive in whichever accumulator is-in engagement with the actuators 3 during the downwardmovement oithetypebarsl. Iian adding and subtracting accumulator is provided, ior'example an accumulator as designated'by reference character 9 in Fig. 2, the digit values to=be recorded in the accumulator may be taken up in the accumulator in subtractive sense dur- 7 ing the downward movement of the type bars.

-Thecamdevices II, I! are flxedon shafts i8,

14 carrying at their ends levers i5, i6 fixed thereto. The levers it, it have pins l1, it, the movement of which in the direction of the arrows it, it, Fig. 2, causes engagement of the accumulators 0, ll with the actuator teeth 1, 0. Similarly, during movement of the pins II, II oppositely to the arrows It, It, disengagement of the accumulators takes place and the parts return to the initial position of Fig. 2. A coupling pawl 38 can be brought into eng ement with the pin II, which pawl is mounted on a pin 01 ot the control member 24, and is held by a spring 40 I: in the position illustrated. The control member 24 slidably guided on the shaft 21 and a pin 28 by means 0! slots II, 20, and in its movement from the position of Fig. 1 to the right it operates the pin il by means of the pawl 38, thereby the accumulator 0 with the actuators 3. On return movement of the control member ll towards the left into the position shown in Fig. i, the accumulator is disengaged.

In a similar manner the accumulator II can be engaged with the control member as. For

this purpose a pin II on the control member 24 hasiointed thereto acoupling pawl ,connected bymeansoialinkllwithanarm ltotthe cmpiin pswi ,andMcanengflgeagainst 66 the action of the spring "which operates the pawl 4| by means of the arm 39 of pawl 38 and link 40, with a pin 43. The pin 43 is fixed on a lever-44 which can rotate on a bolt 45 and is connected by means of a link 46 with the pin l8. When the pawl 4| is coupled with the pin 43, the movement of the control member 24 to the right effects a left-hand movement of the pin l8 in the direction of the arrow i9 and consequently engagement of the accumulator i5 with the actuators 3. Disengagement of the accumulator ID from the actuators 3 takes place during return movement of the control member 24 into the position of Fig. 1.

The two coupling pawls 38, in the example illustrated, are so interconnected that one of them is always in operative position and the other out of operative position. For the purpose of shifting the pawls 38, 4|, a striker pin 41 is provided on the pawl 38 and cooperates with a cam surface 48 on a lever 49, this cam surface 48 consisting of the bevel 480, the upper edge 48a and the curved slot 48b. The lever 49 is pivotally mounted on a pin 58 on the side wall of the machine and is connected to a selector lever 55 through intermediate parts 5|, 52, 53.

In the position A of the selector lever 55, turning about an axle 54 on the side wall, the striker pin 4'! lies on the bevel 48c of the cam surface 48, Fig. 1, in such manner that the pawl 38 stands in operative combination with the accumulator 9. In the position B of the selector lever 55, the striker pin 4'! lies on the upper edge 48a of the cam surface 48. This position of the pin 41 becomes operative from the fact that through movement of the selector lever 55 from the position A into position B the cam surface 48 of the bevel 480 is displaced by rotating the lever 49 clockwise, so that the pin 41 moves upward on the upper edge 48a of the cam surface 48. The pawl 38 is thus freed from the accumulator 9, while the coupling pawl 4| engages with the accumulator ID by means of the pin 43.

By rotation of the selector le er 55 from position B into the position 0, the lever 49 is still further turned clockwise, into the curve-like slot 48b. This curve-like slot 48b of the cam surface 48 is so formed, that on engagement of the pin 41 therein the coupling member 38 again engages with the pin IT. The control member 24 is therefore coupled, in the positions A, Fig. 1, and C, of the selector lever 55 with the accumulator 9, while in the position B of the selector lever 55, it is coupled with the accumulator iii.

The accumulator i0 posesses in accordance with Fig. 2 only one set of wheels, it cannot therefore subtract but effects additions only. Accordingly, the adjustment of the machine to subtraction must be prevented, as soon as the accumulator iii is engaged by the selector lever 55. Accumulator i8 is engaged so soon as the selector lever 55 occupies the position B; In this position of the selector lever- 55 the setting of the machine for subtraction is prevented in the following manner. A rod 98 on the shaft 21 is connected to the lever 49. This rod 99 carries on the left end a lug 9|,which engages with the nose 92 of the subtraction switch bar 93 as follows. In the position A of the selector lever 55, as seen in Fig. 1, the lug 9i occupies a posi- .tion to the left of the nose 92 of the subtraction switch bar 93. On depressing the subtraction switch bar 93 the nose 92 may without contact pass the lug 9i, e. g., the bar 93 can be depressed, whereby the adjustment of the machine to subtraction becomes possible. In position 13 of the selector lever 55, the lug 9i occupies a position inthe path of the nose 92, so that depression of the rod 93 and therewith setting of the machine for subtraction becomes impossible. In the position C of the selector lever 55, the lug 9| occupies a position to the right of the nose 92. In the position C of the selector lever 55, therefore, the machine may again be adjusted to subtraction, since the subtraction motor switch bar 93 can be depressed. In the positions A and C of the selector lever 55 it becomes possible to adjust the machine to subtraction, since in these positions of the selector lever 55 the subtracting accumulator 9 is selected.

The position A diflers from the position B and C in that an upper arm 55 of the lever 49 lies below a pin 51 on a rod 59, while in the positions B and C the arm 55 lies to the right of the pin 51. In the positions B and C, the rod 59, which is guided at its right end by a slide 99 and is pivoted at its left-hand end on a pin 59 on a lever 59, can move downwardly under the action of a spring 94 whereby a pin 5| enters a recess in the rod 59.

The movement of the control member 24 to the right in Fig. 1, and the return movement, are effected by the machine drive means, for which purpose a drive disk 2| isilxed on the drive shaft and is provided with pins 22, 23. These pins 22 and 23 during each machine operatiom' V the positions of Fig. 1.

If the control member 24 at the beginning of I the outward stroke of the machine drive I is to be moved to the right, then by means of a rod 55 a pin 58 thereon is moved to the left whereby the pawl3l brings its shoulder 59 in front of the drive pin 23 under the action of the spring 31. This is effected by turning a bell crank lever 99 in clockwise direction during the taking of a total or a sub-total. In this operation the drive pin 23 at the beginning of its rotation in the direction of arrow 2, strikesagainst the pawl 3| and shifts the control member 24 to the right thereby bringing the operative accumulator into engagement. For taking sum totals, the coupled accumulator must at completion of the forward movement of the machine drive be released from connection with the actuators 3. This is effected by means of the pawl 29, Fig. 1, which is brought into the path of the drive pin 22 by do of the total key 19. The rod of the key 19 forces the lever I7 downward, whereby the pin 15sttached to the lever 11 swings the pawl 29 into the position shown in Fig. 6. The drive pin 22 contacts the pawl 29, Fig. 7 at theend of the forward movement of the machine drive, to which .it moves in the direction of the arrow, thus moving the pawl and therewith the control member 24 toward the left. In this instant, the accumulator coupled to one of the members 39, 4| will be freed from the drive members 3.

In sub-total taking, the accumulator in engagement with the actuators 9, during the forward stroke of the machine drive disc 2i, is not disengaged until the end of the operation of said disc by the striking of the pin 23 against a shoulder 39 on the control member 24. pawl 29 is not actuated in taking subtotals, and

The

the pawl 39 may be in or out of operative position.

The pawl 39 has generally the position shown in Fig. 1. The pin 22 during the forward stroke of the machine drive in the direction of the arrow 2, passes along the pawl 30 and at the end of said stroke comes to lie behind a shoulder I59 on said pawl. Thereby, at the beginning of the return stroke, the drive of the pawl 30 by the pin 22 and right-hand movement of the control member 24 takes place to engage the accumulator for adding or subtracting operations, which, in the machine illustrated, are to be carried out during the return stroke of the disc 2|. The disengagement of the accumulator is effected by the return movement of the control member 24, acting through the parts 23, 39, at the end of the machine operation.

With the pawl 38 in the position of Fig. 1, if the motor drive is switched in by actuation of a motor switch bar 94 operating through parts not illustrated, then an amount set up on the keyboard of the machine is added in the accumulator 9 with the selector lever set at A or C. The actuation of the subtraction motor switch bar 93, on the contrary, with the selector lever 55 in the same positions A or C, produces a subtraction in the accumulator 9. In the position-B of the selector lever 55, actuation of the motor switch bar 94, with the pawl 39 in the position shown, effects an addition in the accumulator iii. The switch bar 93 for subtraction is locked in the position B of the selector lever 55.

For setting the machine to non-addition, the pawl 90 is shifted out of the path of the pin 22 whereby the drive disc 2| produces no movement of the control member 24 either in its forward stroke or in its return stroke. The shifting-of the pawl 39 into its inoperative position is effected by a pin 1| which is moved downwardly by the lever 80, for example on actuation of a non-add key 95. Simultaneously and by means of a pin 12, a bell crank I3 is operated which acts through a pin 14 and a lever IS-to engage the motor drive for a machine operation.

Setting the machine for total or sub-total taking may be effected, for example, by means of keys i8, 81 or in any other manner. The drawings show the total key 18 arranged above a lever 11 which has a pin 15 which operates the pawl 29 and also a pin 19 which actuates the bell cranks 66, i3, and the motor drive by the lever 75, and at the same time moves the rod 85 to the left. The sub-total key 81 is similarly arranged but it operates directlyon the bell crank in order to engage the motor drive by the lever 15 and to effect moving to the left of the rod 65, for influencing the pawl 29.

During the left-hand movement of. the rod 65, not only is the pawl 3| released by the pin 68, but a pin 89 arranged at the right-hand end of the rod 65, and the connection of the rod 65 with the lever 62, effect different shifting operations. By means of the pin 89 a lever 8| is released for movement by a spring 82 until an upper arm 85 of the lever 8| rests against a pin 83 on the. connecting member 38. The connection of the rod 65 with the lever 82 has the following effect.

In the positions B and C of the selector lever 55, the pin 6| 'of the lever 82, which is pivoted on a fixed pin 64, lies in the recess 63 of the rod 58. If in this position of the pin 6| the total key 18 or the sub-total key 61 is actuated, then left-hand movement of the rod 85 produces a right-hand movement of the rod 54, which results in the rotation of the lever 93 about the pin I9 and a swinging out of the pawl 39. In the position A of the selector lever 55, however, the pin 8|, upon actuation of key 18 or 91, passes below the recess 63 and the pawl 39 remains in its working posi tion.

The machine, when the total key II is actuated with the selector lever 55 in position A, operates in the following manner:

Simultaneously with the switching in of the motor drive by the parts 13, I4, 15, the pawls 29, 3| are brought into operative position, the pin 6| passes idly below the recess 63, and the pin 89 releases the upward movement 'of the arm 85. Thereupon, the parts 23, 3|, at the beginning of the forward stroke of the machine drive means shift the control member 24 to the right and cause the accumulator 9 to be engaged bythe coupling pawl 38. The pin 83 of the pawl 38 moves in this operation towards the right along the upper edge of the arm 85, the arm 85 hooking itself behind the pin 83. At the end of the forward stroke the pin 22 passes over the pawl 39 and strikes against the pawl 29, thus moving the control member 24 again to the left and bringing the accumulator 9 out of engagement with the actuators 3. At the end of this disengaging movement, the pin 83 strikes against a cam surface of the arm 85 and shifts the coupling pawls 38, 4| in such a manner that the accumulator 9 disengages from the control member 24' and the accumulator I8 is connected by the pin 43 with the coupling pawl 4|. In this position, at the end of the foreward stroke, the drive pin 22 finds i self in operative position behind the shoulder I59 so that it again moves the control member 24 to the right by means of the pawl 39. In the return stroke of the disc 2| the control member 24 therefore engages the other accumulator l0.

The accumulator I9 remains engaged until at the end of the return stroke the pin 23 strikes the shoulder 39 and shifts the control member 24 again to the left. The control member 24 thus performs a complete operative. movement for engaging and dlsengagaing an accumulator, both in the forward stroke and in the return stroke of the machine drive disc 2 l. During this operation the total in the accumulator 9 is transferred to the accumulator in.

When it is desired that only positive totals shall be transferred from the accumulator 9 to the accumulator i0, mechanism of the following kind is provided:

axis 98, Fig. 3, when the accumulator 9 has a positive content. If the content of the accumulator 9 is negative, the lever 91 and the rod 96 assume the position indicated in broken lines in Fig. 3. The rod 96 is in its position of rest, with its right-hand end according to Fig. 1 in front of a slide 89 which can be moved up and down by the rod 58. The slide 89 is provided with-an angular slot 99 and in its upper position shown in Fig. 3, allows passage of the rod 96 into the slot only when the accumulator 9 has a positive content. If it is attempted with the slide 39 in the upper position, that is with the selector lever at position A, to actuate the total key with a negative content in the accumulator 9, then the rod 99 cannot pass through the slot in the slide 89. The actuation of the total key is thus locked when there is a negative accumulator content, against transmitting'totals. In the lower position of the slide 88, on the other hand, when the selector lever 55 is in the position C, actuation of the total key I8 allows positive and negative totals to be taken without obstruction by the slide 88. By suitable arrangement of the angular slot 88 it may be provided that only negative totals can be taken from the accumulator 8 and transferred to the accumulator I8. Upon actuation of the sub-total key 81 with the selector lever 55 in position A, the machine works as follows:

Simultaneously with the switching in of the motor drive by the parts I3, 14, I5, the pawl 3| is brought into operative position. The pin 6| swings idly below the recess 63 of the rod 58 and the pin 88 of the rod 85 releases movement of the lever 8| whereby the arm 85 can bear against pin 83. At the beginning of the forward stroke of the machine drive disc 2|, the drive pin 23 acts through the pawl 3| to move the control member 24 to the right and to bring the accumulator 8 into engagement with the actuators 3, while the pin 83 slides on the upper edge of the arm 85. The accumulator 8 remains in engagement during the forward stroke and return stroke of the machine drive disc and the pin 22 passes idly over the pawl 38. The accumulator 8 can be disengaged only when at the end of the machine operation the parts 23, 38 effect return of the control member 24 into the illustrated position. In this operation it is immaterial that at the end of the return movement of the control member 24, the pin 83 effects a shifting of the coupling' pawls 38, 3|, because this shifting necessary for transmitting totals, remains inoperative in the present case since in this machine operation an operative movement of the control member 24 to the right and return to the left does not again occur. The shifting of the pawls 38, 4| is indeed prevented at the end of the machine operation, by the key 61 returning to normal position, and the rod 85 is caused by its spring 88 to act upon the lever 8| in such a manner that the parts 85, 83 come out of engagement with each other and the coupling pawls 38, 4| return to the position of Fig. 1 under the action of the spring 42. In the machine illustrated the result is achieved that sub-totals cannot be transferred from the accumulator 8 to the accumulator I8, even when the selector lever 55 is in the position A. In the positions B and C of the selector lever 55, the rod 58 always assumes its lower position, so that the pin 6| is located within the recess 53. Thereby upon actuation of key I8 or 81, the pawl 38 is always disengaged by means of the parts 82, I8, 6|. Thus the pawl 38 can never produce a second to-and-fro movement of the control memmovement of the member 24 by the parts 23, 85 I to engage an accumulator, in the same machine operation. Thus with the selector lever in position B a total is taken by actuating the total key I8, then this is taken out of the accumulator I8 in the forward stroke of the machine drive disc in the direction of the arrow 2, and the upward movement of the actuators and the type bars 4, and the accumulator I8 is again disengaged at the end of the forward stroke, since the drive pin 22 operates together with the pawl 29, which pawl 28 through depression of the total key I8, Figs. 6 and 7, is swung into its active position. The drive pin 22 shifts, as described in the foregoing, with the aid of the pawl 28, the control member 24 again to the left and thereby disengages the accumulator I8 from the actuators 3. In similar manner it is clear that with the selector lever 55 in position C, the total can be withdrawn from the accumulator 8. On setting the machine for sub-total taking by means of the key 61, the accumulator I8 in the position B of the selector lever 55 and the accumulator 9 in the position C of the said lever 55, is engaged at the beginning of the machine operation and is disengaged at the end of the machine operation.

According to Fig. 2, a pin I 88 is provided at the lower end of the lever 49, and engages a bell crank lever I8I pivoted at I84. The bell crank lever- I8I has its upper arm actuating a pin I82 ona lever I83 loosely mounted on the shaft 21. The lever I83 is connected with the type carrier 4' which has a type for each position of the selector lever 55. By means of this connection, si multaneously with the actuation of the selector lever 55, symbols corresponding to the positions A, .B and C are set. Obviously suitable symbol printing means of any known kind can be provided.

It is evident that the number of coupling pawls 38, 4| for producing connection of the control member 24 with the accumulators, is in no wise limited. Each coupling pawl may be operatively associated with a plurality of accumulators. For example, the actuator teeth 8 (Fig. 4) instead of engaging the accumulator I8 may engage a rack I88 guided by means of slots III, H2, and pins II3, I I4, and which can be brought int engagement with several accumulators I89, II9, I28. The movement of the accumulators into and out of engagement with the rack I88 is efiected by crank pins II8, I28, I38 in similar manner as in the case of the accumulator I8 of Fig. 2 operated by the crank pin I8. A coupling pawl II5 .engages the pin I I 8, said pawl being pivoted on a pin IIS on a rod I46. The engagement of the pawl -II5 may be eIIected against the action of spring I I I by rotating a bell crank lever I28, moved manually or automatically, for example by the paper carriage.

To engage the accumulator I 88 to be engaged with the actuators 3, 8, I 88, by means of a lefthand movement of the crank pin II8, the pivot pin II8 of the pawl H5 is mounted on the rod I48 which is guided for longitudinal sliding by slots I2I, I22 and pins I23, I24, and which can be coupled by means of a pin I43 on a lever I44, with the pawl 4'I. In view of this connection the accumulator I 89 can be brought into and out of engagement with its actuators, similarly to the accumulator I 8.

Crank pins I28, I38 serving for the engagement and disengagement of the accumulators II8, I28 are in operative connection with a coupling pawl I25 pivoted on a pin I28 on the rod I46. In the position of Fig. 4 the pawl I25 is in engagement with the crank pin I38. In this case, upon right-hand movement of the coupling pawl 4| and of the pin I43, the pin I38 is driven in the left-hand direction for engagement of the accumulator I 28. By turning of the pawl I25 in anti-clockwise direction, the pin I 38 is released and the pin I28 is brought into engagement with the pawl I25 whereby the movement of the pin I28 is coupled with the movement of the pawl 4 I.*

Thereby the accumulator I I8 can be brought into and out of engagement .with the rack I88. In an intermediate position of the pawl I25, the pins I28, I38 are disconnected. A shifting of thepawl I25 may be effected in response to the presence of a positive or negative condition of the accumulator 9 for which purpose the pawl I25 'is connected by a rod I21 with a bell crank lever I30 jointed to an arm I3I of the rod 50 and drawn by spring I32 constantly in clockwise direction.

when the rod 50 is in its upper position' by action of the arm 56 and the pin 51, with the selector lever 55 in position A, the upper arm of the bell crank lever I30 lies on a level with a contact member I33 fixed onthe rod 96. The rod 30 which rocks to and fro with the arm 91, assumes its right-hand position, Fig. 10, when the accumulator 3 has a positive content, and when the accumulator has a negative content it assumes its left-hand position, Fig. 8. In the position of Fig. 8, the rod 95 and the shoulder I33 lie in a plane with the crank lever I30, while in the position in accordance with Fig. 10 the rod 35 with the shoulder I33 can move by the crank lever without contact, Fig. 24. Accordingly, only with a negative accumulator content, Fig. 8, will a shift of the pawl I25 take place by means of the shoulder I33, the crank lever I30 and the rod I21, Fig. 9, so that instead'of the accumulator I23 the accumulator H9 becomes engaged.

As a result of this arrangement, with the selector lever 55 in position A and with a positive amount in the accumulator 9, actuation of the total key I3 produces no shift of the pawl I25 and therefore positive totals in the accumulator 5, in the return stroke of the machine drive disc, are automatically transferred into the accumulator I23, Fig. 11. Furthermore with the leverand with a negative content in the accumulator 0, on actuating the total key 18, the bell crank lever I30 is driven by the parts 02, I5, I33 and the right-hand part of the pawl I25 is raised. Thereby the pin I28 comes into engagement with the pawl I25, and the accumulator II! is automatically operated to receive the negative total from the accumulator 9, Fig. 9.

On actuation of the sub-total key 61 in the po- 55 in position A,

. sition A of the selector lever 55, there also takes place a selective movement of the accumulators II3, I20, the latter remaining inoperative in the machine illustrated, because no working movement of the control member 24 takes place, with the pawl H in engagement with the pin I43. Since by depression of the sub-total key 61, Fig. 1, only the crank lever is turned, without any downward movement of the lever 11. Consequently, the pawl 29 does not move into the path of the control pin 22 by means of the pin 16 of the lever 11. ll'he control pin 22 of the cam 2I, therefore, at completion of the forward movement of the machine drive, does not move the control member 24 again to the left. Only after completion of the backward movement of the machine drive is the control member 24' moved to the left by means of the control pin 23 from contact with the projection 39 of the control member 24. The control member 24 performs a back and forth movement, for which reason the automatic coupling of the pawl 4| with the pin I43 is dispensed with. In the positions B and C of the lever 55 the arm 56 is to the right of the pin 51 and the rod has moved downwardly in its guide I35. Thereby also the arm I 3I reaches its lower position in which the bellcrank lever I30 lies below the contact member I33. Means may be provided by which the pawl I25 is brought into its inoperative middle position when the selector lever is moveu to position B or C.

The spring I32, at the end of the machine operation, brings the pawl I25 into the position of rest of Fig. 4.

For taking a total from one of the accumulators I09, II9, I29 the lever 55 must be set to position 13. The selecting of the desired accumulator may be performed by suitable means for shifting the pawls II2, I25. Locking means may be provided for preventing that on taking a total more than one accumulator can be brought into engagement.

I claim as my invention:

1. In a calculating machine having calculating mechanism including actuators and a plurality of accumulators; means for shifting each accumulator into and out of engagement with the correspending actuators; keys for controlling the total taking from said accumulators; selector means for determining which accumulator shifting means is to be made operative; a control member operably connectable to the selected shifting means; means including an oscillatory member for moving the control member to efiect a complete shifting operation of at least one selected accumulator during the forward stroke and of another accumulator during the return stroke of said member, said shifting operation including bringing said accumulator into and out of engagement with the corresponding actuators; and means for changing the connection of the control member from one shifting means to another during the operation of the oscillatory member whereby diiferent accumulators are shifted by the forward stroke and return stroke respectively of the oscillatory member.

2. In a calculating machine having calculating mechanism including actuators and a plurality of accumulators; means for shifting each ,accumulator into and out of engagement with the corresponding actuators; keys for controlling the total taking from said accumulators; selector means for determining which accumulator shifting means is to be made operative; a control member operably connectable to the selected shifting'means; means including an oscillatory member for moving the control member to effect a complete shifting operation of at least one selected accumulator during the forward stroke and of another accumulator during the return stroke of said member, said shifting operation including bringing said accumulators into and out of engagement with the corresponding actuators; and a driving connection between the control member and the oscillatory member, part of said driving connection being movable between operative and inoperative position by the total keys under control of said selector means to cause said control member to effect a complete engagement and disengagement operation of only one selected accumulator. i

3. In a calculating machine having calculating during the forward and backward movement only mechamsm mcludmg actuators and plumb y of accumulators; means for shifting each accumulator into and out of engagement with the corresponding actuators; keys for controlling the total taking from said accumulators; selector means for determining which accumulator shifting means is to be made operative; a control member; a coupling pawl between said control member and each accumulator shifting means, each of said pawls being movable to connect and disconnect said control member and shifting means; means including an oscillatory member and the oscillatory member include a member which on actuation at the beginning oi the return stroke of the machine drive means eflects a movement of the control member for engaging one or a plurality of accumulators in dependence on the position of the selector lever, said connecting member being shiitable in dependence on the position or the lever and by operation of the total taking key.

HEINRICH KONRAD FRIEDRICH EWALD.

JOHANNES GEBHARDT. 

